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BACKUP COOLING KIT (OPTION)
With the Backup cooling kit (CVK-UB4), the freezer prevents the chamber temperature from going up by
injecting the liquid CO
2
gas when the power supply is disconnected (power failure, disconnection of power
cord, breaker OFF) or in the case of failure of freezer itself. The liquid CO
2
gas is injected with the
activation of solenoid valve energized by battery when the chamber temperature reaches the alarm
temperature.
Following shows the procedure for setting the Backup cooling kit.
1.
Setting of liquid CO
2
gas cylinder
By using the joint and pipe enclosed with the
Backup cooling kit, connect the liquid CO
2
gas
cylinder to the joint of the Backup cooling kit. For
this setting, consult with a qualified gas supplier or
our sales agency.
2.
After setting the liquid CO
2
gas cylinder, operate
the freezer until the chamber temperature reaches
the required level.
3.
Set the temperature of back-up operation at the
temperature higher than -70
o
C. The Backup
cooling kit is operated continuously if the
temperature of back-up operation is set at the
temperature lower than -70
o
C. This means the
liquid CO
2
gas is consumed very quickly.
4.
Switch on the Backup cooling kit.
5.
Make sure that liquid CO
2
gas spouts into the freezer chamber by pressing the back-up test switch.
Note:
The liquid CO
2
gas cylinder loses its cooling capacity at speed when the ambient temperature is over
31
o
C. Install the liquid CO
2
gas cylinder in the cool environment. And the duration of back-up time per
one liquid CO
2
gas cylinder varies depending on the ambient temperature. Refer to “Installation of
Backup cooling kit” enclosed with the Backup cooling kit for the available back-up time.
The liquid CO
2
gas cylinder should be a siphon type.
Use the pipe encloses with the Backup cooling kit for the setting. (The extension of the pipe is not
permitted because of cooling capacity.)
Rough scheme (back side)
Liquid CO
2
gas cylinder
